I am trying to run a Ubuntu 11.10 guest on a Ubuntu 10.04 host, and the guest freezes up when I try to log in using the "Ubuntu" (ie. Unity 3D) interface. If I log in using the "Ubuntu 2D" (ie. Unity 2D) interface, everything is fine.

I have attached the log file. From what I have read in a similar post (topic id #46120, the forum software won't let me post any links), the relevant lines are:

According to the post linked above, this error is indicative of driver issues. My chipset is the ATI Technologies Inc RS880 (Radeon HD 4200), and the driver I am using is the open source radeon driver (version 1:6.13.0-1ubuntu5 of the xserver-xorg-video-radeon package).

If anyone has any ideas, I would be very appreciative. Thanks in advance!

Can you run glxgears on the host?It is possible I suppose that the version of Xorg that 10.04 uses might be an issue. I don't have a host of that vintage any more.I know when Ubuntu came out with Unity there was a lot discussed on what it would run on.

According to everything I see here you should be able to run Unity 3D. Searching for this issue I only find 4 others that have and reported this here and Bugtracker.With that you would need to raise a ticket at bugtracker so the DEVs can see what might need to be done.Be sure to add as much information as you can and attach a guests log file. (preferably one while trying to get Unity going) You can also link back to this discussion so they can see the rest.